By voluntary, I mean, as we stated before, whatsoever of things in his own power a man does with knowledge, and the absence of ignorance as to the person to whom, or the instrument with which, or the result with which he does; as, for instance, whom he strikes, what he strikes him with, and with what probable result; and each of these points again, not accidentally nor by compulsion; as supposing another man were to seize his hand and strike a third person with it, here, of course, the owner of the hand acts not voluntarily, because it did not rest with him to do or leave undone: or again, it is conceivable that the person struck may be his father, and he may know that it is a man, or even one of the present company, whom he is striking, but not know that it is his father. And let these same distinctions be supposed to be carried into the case of the result and in fact the whole of any given action. In fine then, that is involuntary which is done through ignorance, or which, not resulting from ignorance, is not in the agent’s control or is done on compulsion. I mention these cases, because there are many natural things which we do and suffer knowingly but still no one of which is either voluntary or involuntary, growing old, or dying, for instance. Again, accidentality may attach to the unjust in like manner as to the just acts. For instance, a man may have restored what was deposited with him, but against his will and from fear of the consequences of a refusal: we must not say that he either does what is just, or does justly, except accidentally: and in like manner the man who through compulsion and against his will fails to restore a deposit, must be said to do unjustly, or to do what is unjust, accidentally only. Again, voluntary actions we do either from deliberate choice or without it; from it, when we act from previous deliberation; without it, when without any previous deliberation. Since then hurts which may be done in transactions between man and man are threefold, those mistakes which are attended with ignorance are, when a man either does a thing not to the man to whom he meant to do it, or not the thing he meant to do, or not with the instrument, or not with the result which he intended: either he did not think he should hit him at all, or not with this, or this is not the man he thought he should hit, or he did not think this would be the result of the blow but a result has followed which he did not anticipate; as, for instance, he did it not to wound but merely to prick him; or it is not the man whom, or the way in which, he meant.